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The original part number for most GM cars from 62 up (using the externally regulated alternator) was 1119515. There were a few exceptions like Transistorized Ignition or 62 amp alternators, but for the most part, that's what you want.

Scouring wrecking yards over the last 35 to 40 some odd years, I've seen both "riveted" and "screwed on" AC Delco covers. I'm not sure why since (I believe), AC Delco was the sole supplier. I could see variances if there were more than one supplier, but I don't understand why the two versions from one source. Of course, one or the other (riveted or screwed on) could have been an "over the counter" replacement, so I'm not sure which one is correct. Riveted? Screwed on? John Hinckley, I'm sure this has been chewed up many times on the Corvette forums. What's the consensus?

If you mean a date code for Voltage Regulators, yes there is. It will be in a format like "8E" which would be "Year & Month". In this example, "8E" would be May, 1968. However, it could also mean May of 1978, May of 1988 or May of 1998. Voltage regulators were still available from the dealer long after these cars were built and AC Delco continued to be the supplier. I don't think they're available "new" any longer though.

great, thanks. that make good sense, A-L for the months. i had a high pressure power steering hose burst while my wife had the car out many years ago, and when the replaced the burnt wiring components, they stuck in a philco, alas. i should have done the work myself ...ferenc

here are two pictures showing the location of the stampings. The first is a full shot showing the whole regulator, and the second a blow up of the stampings. (Don't worry, you're not seeing things. They are 2 different regulators with the first being a May, 1969 unit, and the second being a June, 1968 unit.)

As for "how" they were stamped, I'm assuming they had some kind of gang stamp like used on the engines/transmissions, etc... Much smaller but basically the same concept.